Cited by 695Sex and Gender in HealthcareAdvanced Neuroimaging Techniques and ApplicationsNeural and Behavioral Psychology Studies

Sex differences in cortical thickness mapped in 176 healthy individuals between 7 and 87 years of age

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Sowell, E. R., Peterson, B. S., Kan, E., Woods, R. P., Yoshii, J., Bansal, R., Xu, D., Zhu, H. +2 more·2007·Cerebral Cortex

Abstract

Findings from previous magnetic resonance imaging studies of sex differences in gray matter have been inconsistent, with some showing proportionally increased gray matter in women and some showing no differences between the sexes. Regional sex differences in gray matter thickness have not yet been mapped over the entire cortical surface in a large sample of subjects spanning the age range from early childhood to old age. We applied algorithms for cortical pattern matching and techniques for measuring cortical thickness to the structural magnetic resonance images of 176 healthy individuals between the ages of 7 and 87 years. We also mapped localized differences in brain size. Maps of sex differences in cortical thickness revealed thicker cortices in women in right inferior parietal and posterior temporal regions even without correcting for total brain volume. In these regions, the cortical mantle is up to 0.45 mm thicker, on average, in women than in men. Analysis of a subset of 18 female and 18 male subjects matched for age and brain volume confirmed the significance of thicker gray matter in temporal and parietal cortices in females, independent of brain size differences. Further analyses were conducted in the adult subjects where gender differences were evaluated using height as a covariate, and similar sex differences were observed even when body size differences between the sexes were controlled. Together, these results suggest that greater cortical thickness in posterior temporal inferior parietal regions in females relative to males are independent of differences in brain or body size. Age-by-sex interactions were not significant in the temporoparietal region, suggesting that sex differences in these regions are present from at least late childhood and then are maintained throughout life. Male brains were larger than female brains in all locations, though male enlargement was most prominent in the frontal and occipital poles, bilaterally. Given the large sample and the large range of ages studied, these results help to address controversies in the study of central nervous system sexual dimorphisms.

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  1. Evans AC, Collins DL, Holmes CJ. Automatic 3D regional MRI segmentation and statistical probabilistic anatomical maps. New York: Academic Press; 1996. [Google Scholar]
  2. Von Economo CV. The cytoarchitectonics of the human cerebral cortex. London: Oxford Medical Publications; 1929. [Google Scholar]

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Authors
Sowell, E. R., Peterson, B. S., Kan, E., Woods, R. P., Yoshii, J., Bansal, R., Xu, D., Zhu, H., Thompson, P. M., & Toga, A. W.
Affiliations
  • University of California, Los Angeles (US)
  • New York State Psychiatric Institute (US)
Venue
Cerebral Cortex
Published
2006-08-31
Volume
17
Issue
7
Pages
1550-1560
ISSN
  • 1047-3211 (ISSN-L)
  • 1460-2199
OpenAlex
W2117102945
Cited by
695
References
67
Citations by year
2026: 13 · 2025: 14 · 2024: 22 · 2023: 27 · 2022: 31 · 2021: 41 · 2020: 89 · 2019: 23 · 2018: 42 · 2017: 34 · 2016: 28 · 2015: 45 · 2014: 38 · 2013: 61 · 2012: 37
FWCI
22.64
Type
journal article
Language
en
Open access
Locations
  • Cerebral Cortex (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health (5k02mh074677-05)
  • U.S. Public Health Service (MHK02-74677)
  • National Institute on Aging (AG-016570, P50AG016570)
  • National Institute of Mental Health (K01 MH 01733, MH59139, R01MH059139, R01MH068318, MH 068318, K01MH001733, K02-MH-074677)
  • National Institute on Drug Abuse (R21DA015878, R01 017830DA, R01DA017830)
  • National Institute of Neurological Disorders and Stroke (NS3753)
  • National Institute of Biomedical Imaging and Bioengineering (EB 01651)
  • U.S. National Library of Medicine (LM 05639, R01LM005639)
  • National Center for Research Resources (P41RR013642, R21RR019771, U54RR021813, RR019771)
Topics
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Sex and Gender in Healthcare
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced Neuroimaging Techniques and Applications
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
Keywords
sex differences, cortical thickness, gray matter, sexual dimorphism, brain size, inferior parietal cortex, posterior temporal cortex, age differences, brain development, brain aging, body size
MeSH terms
Adolescent, Adult, Aged, Aged, 80 and over, Cerebral Cortex, Child, Female, Humans, Image Interpretation, Computer-Assisted, Magnetic Resonance Imaging, Male, Middle Aged, Organ Size, Sex Factors, Imaging, Three-Dimensional

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